[clang] [clang] Add support for -fcx-limited-range and #pragma CX_LIMITED_RANGE. (PR #68820)
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cfe-commits at lists.llvm.org
Mon Jul 14 12:14:31 PDT 2025
llvmbot wrote:
<!--LLVM PR SUMMARY COMMENT-->
@llvm/pr-subscribers-clang
Author: Zahira Ammarguellat (zahiraam)
<details>
<summary>Changes</summary>
This patch adds the #pragma CX_LIMITED_RANGE defined in the C specification.
It also adds the options -f[no]cx-limited-range and -f[no]cx-fortran-rules.
Their behavior is like the gcc’s command line options.
---
Patch is 27.76 KiB, truncated to 20.00 KiB below, full version: https://github.com/llvm/llvm-project/pull/68820.diff
14 Files Affected:
- (modified) clang/include/clang/Basic/FPOptions.def (+2)
- (modified) clang/include/clang/Basic/LangOptions.def (+3)
- (modified) clang/include/clang/Basic/TokenKinds.def (+5)
- (modified) clang/include/clang/Driver/Options.td (+17)
- (modified) clang/include/clang/Parse/Parser.h (+4)
- (modified) clang/include/clang/Sema/Sema.h (+4)
- (modified) clang/lib/CodeGen/CGExprComplex.cpp (+135-23)
- (modified) clang/lib/Driver/ToolChains/Clang.cpp (+34)
- (modified) clang/lib/Parse/ParsePragma.cpp (+39-1)
- (modified) clang/lib/Parse/ParseStmt.cpp (+10)
- (modified) clang/lib/Parse/Parser.cpp (+3)
- (modified) clang/lib/Sema/SemaAttr.cpp (+7)
- (added) clang/test/CodeGen/cx-complex-range.c (+79)
- (added) clang/test/CodeGen/pragma-cx-limited-range.c (+150)
``````````diff
diff --git a/clang/include/clang/Basic/FPOptions.def b/clang/include/clang/Basic/FPOptions.def
index 5b923a1944e50..b633004386eb0 100644
--- a/clang/include/clang/Basic/FPOptions.def
+++ b/clang/include/clang/Basic/FPOptions.def
@@ -28,4 +28,6 @@ OPTION(FPEvalMethod, LangOptions::FPEvalMethodKind, 2, AllowApproxFunc)
OPTION(Float16ExcessPrecision, LangOptions::ExcessPrecisionKind, 2, FPEvalMethod)
OPTION(BFloat16ExcessPrecision, LangOptions::ExcessPrecisionKind, 2, Float16ExcessPrecision)
OPTION(MathErrno, bool, 1, BFloat16ExcessPrecision)
+OPTION(CxLimitedRange, bool, 1, MathErrno)
+OPTION(CxFortranRules, bool, 1, CxLimitedRange)
#undef OPTION
diff --git a/clang/include/clang/Basic/LangOptions.def b/clang/include/clang/Basic/LangOptions.def
index c0ea4ecb9806a..5ac0b9143e223 100644
--- a/clang/include/clang/Basic/LangOptions.def
+++ b/clang/include/clang/Basic/LangOptions.def
@@ -219,6 +219,9 @@ BENIGN_LANGOPT(NoSignedZero , 1, 0, "Permit Floating Point optimization wit
BENIGN_LANGOPT(AllowRecip , 1, 0, "Permit Floating Point reciprocal")
BENIGN_LANGOPT(ApproxFunc , 1, 0, "Permit Floating Point approximation")
+LANGOPT(CxLimitedRange, 1, 0, "Enable use of algebraic expansions of complex arithmetics.")
+LANGOPT(CxFortranRules, 1, 0, "Enable use of range reduction for complex arithmetics.")
+
BENIGN_LANGOPT(ObjCGCBitmapPrint , 1, 0, "printing of GC's bitmap layout for __weak/__strong ivars")
BENIGN_LANGOPT(AccessControl , 1, 1, "C++ access control")
diff --git a/clang/include/clang/Basic/TokenKinds.def b/clang/include/clang/Basic/TokenKinds.def
index 94db56a9fd5d7..5cd81a66ab57b 100644
--- a/clang/include/clang/Basic/TokenKinds.def
+++ b/clang/include/clang/Basic/TokenKinds.def
@@ -904,6 +904,11 @@ PRAGMA_ANNOTATION(pragma_fenv_access_ms)
// handles them.
PRAGMA_ANNOTATION(pragma_fenv_round)
+// Annotation for #pragma STDC CX_LIMITED_RANGE
+// The lexer produces these so that they only take effect when the parser
+// handles them.
+PRAGMA_ANNOTATION(pragma_cx_limited_range)
+
// Annotation for #pragma float_control
// The lexer produces these so that they only take effect when the parser
// handles them.
diff --git a/clang/include/clang/Driver/Options.td b/clang/include/clang/Driver/Options.td
index ff2130c93f28e..5efce223d4b8e 100644
--- a/clang/include/clang/Driver/Options.td
+++ b/clang/include/clang/Driver/Options.td
@@ -1001,6 +1001,23 @@ defm offload_uniform_block : BoolFOption<"offload-uniform-block",
NegFlag<SetFalse, [], [ClangOption, CC1Option], "Don't assume">,
BothFlags<[], [ClangOption], " that kernels are launched with uniform block sizes (default true for CUDA/HIP and false otherwise)">>;
+def fcx_limited_range : Joined<["-"], "fcx-limited-range">,
+ Group<f_Group>, Visibility<[ClangOption, CC1Option]>,
+ HelpText<"Basic algebraic expansions of complex arithmetic operations "
+ "involving are enabled.">,
+ MarshallingInfoFlag<LangOpts<"CxLimitedRange">>;
+def fno_cx_limited_range : Joined<["-"], "fno-cx-limited-range">,
+ Group<f_Group>, Visibility<[ClangOption, CC1Option]>,
+ HelpText<"Basic algebraic expansions of complex arithmetic operations "
+ "involving are enabled.">;
+def fcx_fortran_rules : Joined<["-"], "fcx-fortran-rules">,
+ Group<f_Group>, Visibility<[ClangOption, CC1Option]>,
+ HelpText<"Range reduction is enabled for complex arithmetic operations.">,
+ MarshallingInfoFlag<LangOpts<"CxFortranRules">>;
+def fno_cx_fortran_rules : Joined<["-"], "fno-cx-fortran-rules">,
+ Group<f_Group>, Visibility<[ClangOption, CC1Option]>,
+ HelpText<"Range reduction is disabled for complex arithmetic operations.">;
+
// OpenCL-only Options
def cl_opt_disable : Flag<["-"], "cl-opt-disable">, Group<opencl_Group>,
Visibility<[ClangOption, CC1Option]>,
diff --git a/clang/include/clang/Parse/Parser.h b/clang/include/clang/Parse/Parser.h
index 0e969f341bbe1..8f2b4d50fd59e 100644
--- a/clang/include/clang/Parse/Parser.h
+++ b/clang/include/clang/Parse/Parser.h
@@ -767,6 +767,10 @@ class Parser : public CodeCompletionHandler {
/// #pragma STDC FENV_ROUND...
void HandlePragmaFEnvRound();
+ /// Handle the annotation token produced for
+ /// #pragma STDC CX_LIMITED_RANGE...
+ void HandlePragmaCXLimitedRange();
+
/// Handle the annotation token produced for
/// #pragma float_control
void HandlePragmaFloatControl();
diff --git a/clang/include/clang/Sema/Sema.h b/clang/include/clang/Sema/Sema.h
index 5bef0335f7891..f206f5de1310e 100644
--- a/clang/include/clang/Sema/Sema.h
+++ b/clang/include/clang/Sema/Sema.h
@@ -10948,6 +10948,10 @@ class Sema final {
/// \#pragma STDC FENV_ACCESS
void ActOnPragmaFEnvAccess(SourceLocation Loc, bool IsEnabled);
+ /// ActOnPragmaCXLimitedRange - Called on well formed
+ /// \#pragma STDC CX_LIMITED_RANGE
+ void ActOnPragmaCXLimitedRange(SourceLocation Loc, bool IsEnabled);
+
/// Called on well formed '\#pragma clang fp' that has option 'exceptions'.
void ActOnPragmaFPExceptions(SourceLocation Loc,
LangOptions::FPExceptionModeKind);
diff --git a/clang/lib/CodeGen/CGExprComplex.cpp b/clang/lib/CodeGen/CGExprComplex.cpp
index f3cbd1d0451eb..4b559a5dc7479 100644
--- a/clang/lib/CodeGen/CGExprComplex.cpp
+++ b/clang/lib/CodeGen/CGExprComplex.cpp
@@ -275,6 +275,10 @@ class ComplexExprEmitter
ComplexPairTy EmitBinSub(const BinOpInfo &Op);
ComplexPairTy EmitBinMul(const BinOpInfo &Op);
ComplexPairTy EmitBinDiv(const BinOpInfo &Op);
+ ComplexPairTy EmitAlgebraicDiv(llvm::Value *A, llvm::Value *B, llvm::Value *C,
+ llvm::Value *D);
+ ComplexPairTy EmitRangeReductionDiv(llvm::Value *A, llvm::Value *B,
+ llvm::Value *C, llvm::Value *D);
ComplexPairTy EmitComplexBinOpLibCall(StringRef LibCallName,
const BinOpInfo &Op);
@@ -761,6 +765,21 @@ ComplexPairTy ComplexExprEmitter::EmitBinMul(const BinOpInfo &Op) {
CodeGenFunction::CGFPOptionsRAII FPOptsRAII(CGF, Op.FPFeatures);
if (Op.LHS.second && Op.RHS.second) {
+ // (a+ib)*(c+id) = (ac-bd)+i(bc+ad)
+ if (Op.FPFeatures.getCxLimitedRange() ||
+ CGF.getLangOpts().CxLimitedRange) {
+ llvm::Value *LHSr = Op.LHS.first, *LHSi = Op.LHS.second;
+ llvm::Value *RHSr = Op.RHS.first, *RHSi = Op.RHS.second;
+
+ llvm::Value *AC = Builder.CreateFMul(LHSr, RHSr); // ac
+ llvm::Value *BD = Builder.CreateFMul(LHSi, RHSi); // bd
+ llvm::Value *DSTr = Builder.CreateFSub(AC, BD); // ac-bd
+
+ llvm::Value *BC = Builder.CreateFMul(LHSi, RHSr); // bc
+ llvm::Value *AD = Builder.CreateFMul(LHSr, RHSi); // ad
+ llvm::Value *DSTi = Builder.CreateFAdd(BC, AD); // bc+ad
+ return ComplexPairTy(DSTr, DSTi);
+ }
// If both operands are complex, emit the core math directly, and then
// test for NaNs. If we find NaNs in the result, we delegate to a libcall
// to carefully re-compute the correct infinity representation if
@@ -846,6 +865,105 @@ ComplexPairTy ComplexExprEmitter::EmitBinMul(const BinOpInfo &Op) {
return ComplexPairTy(ResR, ResI);
}
+ComplexPairTy ComplexExprEmitter::EmitAlgebraicDiv(llvm::Value *LHSr,
+ llvm::Value *LHSi,
+ llvm::Value *RHSr,
+ llvm::Value *RHSi) {
+ // (a+ib) / (c+id) = ((ac+bd)/(cc+dd)) + i((bc-ad)/(cc+dd))
+ llvm::Value *DSTr, *DSTi;
+
+ llvm::Value *AC = Builder.CreateFMul(LHSr, RHSr); // a*c
+ llvm::Value *BD = Builder.CreateFMul(LHSi, RHSi); // b*d
+ llvm::Value *ACpBD = Builder.CreateFAdd(AC, BD); // ac+bd
+
+ llvm::Value *CC = Builder.CreateFMul(RHSr, RHSr); // c*c
+ llvm::Value *DD = Builder.CreateFMul(RHSi, RHSi); // d*d
+ llvm::Value *CCpDD = Builder.CreateFAdd(CC, DD); // cc+dd
+
+ llvm::Value *BC = Builder.CreateFMul(LHSi, RHSr); // b*c
+ llvm::Value *AD = Builder.CreateFMul(LHSr, RHSi); // a*d
+ llvm::Value *BCmAD = Builder.CreateFSub(BC, AD); // bc-ad
+
+ DSTr = Builder.CreateFDiv(ACpBD, CCpDD);
+ DSTi = Builder.CreateFDiv(BCmAD, CCpDD);
+ return ComplexPairTy(DSTr, DSTi);
+}
+
+/// EmitFAbs - Emit a call to @llvm.fabs.
+static llvm::Value *EmitllvmFAbs(CodeGenFunction &CGF, llvm::Value *Value) {
+ llvm::Function *Func =
+ CGF.CGM.getIntrinsic(llvm::Intrinsic::fabs, Value->getType());
+ llvm::Value *Call = CGF.Builder.CreateCall(Func, Value);
+ return Call;
+}
+
+ComplexPairTy ComplexExprEmitter::EmitRangeReductionDiv(llvm::Value *LHSr,
+ llvm::Value *LHSi,
+ llvm::Value *RHSr,
+ llvm::Value *RHSi) {
+ // (a + ib) / (c + id) = (e + if)
+ llvm::Value *FAbsRHSr = EmitllvmFAbs(CGF, RHSr); // |c|
+ llvm::Value *FAbsRHSi = EmitllvmFAbs(CGF, RHSi); // |d|
+ // |c| >= |d|
+ llvm::Value *IsR = Builder.CreateFCmpUGT(FAbsRHSr, FAbsRHSi, "abs_cmp");
+
+ llvm::BasicBlock *TrueBB = CGF.createBasicBlock("true_bb_name");
+ llvm::BasicBlock *FalseBB = CGF.createBasicBlock("false_bb_name");
+ llvm::BasicBlock *ContBB = CGF.createBasicBlock("cont_bb");
+ Builder.CreateCondBr(IsR, TrueBB, FalseBB);
+
+ CGF.EmitBlock(TrueBB);
+ // abs(c) >= abs(d)
+ // r = d/c
+ // tmp = c + rd
+ // e = (a + br)/tmp
+ // f = (b - ar)/tmp
+ llvm::Value *DdC = Builder.CreateFDiv(RHSi, RHSr); // d/c
+
+ llvm::Value *RD = Builder.CreateFMul(DdC, RHSi); // (d/c)d
+ llvm::Value *CpRD = Builder.CreateFAdd(RHSr, RD); // c+((d/c)d)
+
+ llvm::Value *T3 = Builder.CreateFMul(LHSi, DdC); // b(d/c)
+ llvm::Value *T4 = Builder.CreateFAdd(LHSr, T3); // a+b(d/c)
+ llvm::Value *DSTTr = Builder.CreateFDiv(T4, CpRD); // (a+b(d/c))/(c+(d/c)d)
+
+ llvm::Value *T5 = Builder.CreateFMul(LHSr, DdC); // ar
+ llvm::Value *T6 = Builder.CreateFSub(LHSi, T5); // b-ar
+ llvm::Value *DSTTi = Builder.CreateFDiv(T6, CpRD); // (b-a(d/c))/(c+(d/c)d)
+ Builder.CreateBr(ContBB);
+
+ CGF.EmitBlock(FalseBB);
+ // abs(c) < abs(d)
+ // r = c/d
+ // tmp = d + rc
+ // e = (ar + b)/tmp
+ // f = (br - a)/tmp
+ llvm::Value *CdD = Builder.CreateFDiv(RHSr, RHSi); // c/d
+
+ llvm::Value *RC = Builder.CreateFMul(CdD, RHSr); // (c/d)c
+ llvm::Value *DpRC = Builder.CreateFAdd(RHSi, RC); // d+(c/d)c
+
+ llvm::Value *T7 = Builder.CreateFAdd(CdD, RHSi); // (c/d)+b
+ llvm::Value *T8 = Builder.CreateFMul(LHSr, T7); // a((c/d)+b)
+ llvm::Value *DSTFr = Builder.CreateFDiv(T8, DpRC); // (a((c/d)+b)/(d+(c/d)c))
+
+ llvm::Value *T9 = Builder.CreateFSub(CdD, LHSr); // (c/d)-a
+ llvm::Value *T10 = Builder.CreateFMul(RHSi, T9); // b((c/d)-a)
+ llvm::Value *DSTFi =
+ Builder.CreateFDiv(T10, DpRC); // (b((c/d)-a))/(d+(c/d)c))
+ Builder.CreateBr(ContBB);
+
+ // Phi together the computation paths.
+ CGF.EmitBlock(ContBB);
+ llvm::PHINode *VALr = Builder.CreatePHI(DSTTr->getType(), 2);
+ VALr->addIncoming(DSTTr, TrueBB);
+ VALr->addIncoming(DSTFr, FalseBB);
+ llvm::PHINode *VALi = Builder.CreatePHI(DSTTi->getType(), 2);
+ VALi->addIncoming(DSTTi, TrueBB);
+ VALi->addIncoming(DSTFi, FalseBB);
+ return ComplexPairTy(VALr, VALi);
+}
+
// See C11 Annex G.5.1 for the semantics of multiplicative operators on complex
// typed values.
ComplexPairTy ComplexExprEmitter::EmitBinDiv(const BinOpInfo &Op) {
@@ -854,15 +972,23 @@ ComplexPairTy ComplexExprEmitter::EmitBinDiv(const BinOpInfo &Op) {
llvm::Value *DSTr, *DSTi;
if (LHSr->getType()->isFloatingPointTy()) {
- // If we have a complex operand on the RHS and FastMath is not allowed, we
- // delegate to a libcall to handle all of the complexities and minimize
- // underflow/overflow cases. When FastMath is allowed we construct the
- // divide inline using the same algorithm as for integer operands.
- //
- // FIXME: We would be able to avoid the libcall in many places if we
- // supported imaginary types in addition to complex types.
CodeGenFunction::CGFPOptionsRAII FPOptsRAII(CGF, Op.FPFeatures);
- if (RHSi && !CGF.getLangOpts().FastMath) {
+ if (RHSi && CGF.getLangOpts().CxFortranRules &&
+ !Op.FPFeatures.getCxLimitedRange()) {
+ return EmitRangeReductionDiv(LHSr, LHSi, RHSr, RHSi);
+ } else if (RHSi && (Op.FPFeatures.getCxLimitedRange() ||
+ CGF.getLangOpts().CxLimitedRange)) {
+ if (!LHSi)
+ LHSi = llvm::Constant::getNullValue(RHSi->getType());
+ return EmitAlgebraicDiv(LHSr, LHSi, RHSr, RHSi);
+ } else if (RHSi && !CGF.getLangOpts().FastMath) {
+ // If we have a complex operand on the RHS and FastMath is not allowed, we
+ // delegate to a libcall to handle all of the complexities and minimize
+ // underflow/overflow cases. When FastMath is allowed we construct the
+ // divide inline using the same algorithm as for integer operands.
+ //
+ // FIXME: We would be able to avoid the libcall in many places if we
+ // supported imaginary types in addition to complex types.
BinOpInfo LibCallOp = Op;
// If LHS was a real, supply a null imaginary part.
if (!LHSi)
@@ -888,21 +1014,7 @@ ComplexPairTy ComplexExprEmitter::EmitBinDiv(const BinOpInfo &Op) {
if (!LHSi)
LHSi = llvm::Constant::getNullValue(RHSi->getType());
- // (a+ib) / (c+id) = ((ac+bd)/(cc+dd)) + i((bc-ad)/(cc+dd))
- llvm::Value *AC = Builder.CreateFMul(LHSr, RHSr); // a*c
- llvm::Value *BD = Builder.CreateFMul(LHSi, RHSi); // b*d
- llvm::Value *ACpBD = Builder.CreateFAdd(AC, BD); // ac+bd
-
- llvm::Value *CC = Builder.CreateFMul(RHSr, RHSr); // c*c
- llvm::Value *DD = Builder.CreateFMul(RHSi, RHSi); // d*d
- llvm::Value *CCpDD = Builder.CreateFAdd(CC, DD); // cc+dd
-
- llvm::Value *BC = Builder.CreateFMul(LHSi, RHSr); // b*c
- llvm::Value *AD = Builder.CreateFMul(LHSr, RHSi); // a*d
- llvm::Value *BCmAD = Builder.CreateFSub(BC, AD); // bc-ad
-
- DSTr = Builder.CreateFDiv(ACpBD, CCpDD);
- DSTi = Builder.CreateFDiv(BCmAD, CCpDD);
+ return EmitAlgebraicDiv(LHSr, LHSi, RHSr, RHSi);
} else {
assert(LHSi && "Can have at most one non-complex operand!");
diff --git a/clang/lib/Driver/ToolChains/Clang.cpp b/clang/lib/Driver/ToolChains/Clang.cpp
index 129adfb9fcc74..495ccc82e8c45 100644
--- a/clang/lib/Driver/ToolChains/Clang.cpp
+++ b/clang/lib/Driver/ToolChains/Clang.cpp
@@ -2807,6 +2807,9 @@ static void RenderFloatingPointOptions(const ToolChain &TC, const Driver &D,
bool StrictFPModel = false;
StringRef Float16ExcessPrecision = "";
StringRef BFloat16ExcessPrecision = "";
+ StringRef CxLimitedRange = "NoCxLimiteRange";
+ StringRef CxFortranRules = "NoCxFortranRules";
+ StringRef Range = "";
if (const Arg *A = Args.getLastArg(options::OPT_flimited_precision_EQ)) {
CmdArgs.push_back("-mlimit-float-precision");
@@ -2819,6 +2822,28 @@ static void RenderFloatingPointOptions(const ToolChain &TC, const Driver &D,
switch (optID) {
default:
break;
+ case options::OPT_fcx_limited_range: {
+ if (Range == "")
+ Range = "CxLimitedRange";
+ else
+ D.Diag(clang::diag::err_drv_incompatible_options)
+ << "fcx-limited-range" << Range;
+ break;
+ }
+ case options::OPT_fno_cx_limited_range:
+ Range = "NoCxLimitedRange";
+ break;
+ case options::OPT_fcx_fortran_rules: {
+ if (Range == "")
+ Range = "CxFortranRules";
+ else
+ D.Diag(clang::diag::err_drv_incompatible_options)
+ << "fcx-fortan-rules" << Range;
+ break;
+ }
+ case options::OPT_fno_cx_fortran_rules:
+ CxFortranRules = "NoCxFortranRules";
+ break;
case options::OPT_ffp_model_EQ: {
// If -ffp-model= is seen, reset to fno-fast-math
HonorINFs = true;
@@ -3240,6 +3265,15 @@ static void RenderFloatingPointOptions(const ToolChain &TC, const Driver &D,
if (Args.hasFlag(options::OPT_fno_strict_float_cast_overflow,
options::OPT_fstrict_float_cast_overflow, false))
CmdArgs.push_back("-fno-strict-float-cast-overflow");
+
+ if (const Arg *A = Args.getLastArg(options::OPT_fcx_limited_range))
+ CmdArgs.push_back("-fcx-limited-range");
+ if (const Arg *A = Args.getLastArg(options::OPT_fcx_fortran_rules))
+ CmdArgs.push_back("-fcx-fortran-rules");
+ if (const Arg *A = Args.getLastArg(options::OPT_fno_cx_limited_range))
+ CmdArgs.push_back("-fno-cx-limited-range");
+ if (const Arg *A = Args.getLastArg(options::OPT_fno_cx_fortran_rules))
+ CmdArgs.push_back("-fno-cx-fortran-rules");
}
static void RenderAnalyzerOptions(const ArgList &Args, ArgStringList &CmdArgs,
diff --git a/clang/lib/Parse/ParsePragma.cpp b/clang/lib/Parse/ParsePragma.cpp
index b3178aef64d72..6e4db5da9fdbc 100644
--- a/clang/lib/Parse/ParsePragma.cpp
+++ b/clang/lib/Parse/ParsePragma.cpp
@@ -137,7 +137,20 @@ struct PragmaSTDC_CX_LIMITED_RANGEHandler : public PragmaHandler {
void HandlePragma(Preprocessor &PP, PragmaIntroducer Introducer,
Token &Tok) override {
tok::OnOffSwitch OOS;
- PP.LexOnOffSwitch(OOS);
+ if (PP.LexOnOffSwitch(OOS))
+ return;
+
+ MutableArrayRef<Token> Toks(
+ PP.getPreprocessorAllocator().Allocate<Token>(1), 1);
+
+ Toks[0].startToken();
+ Toks[0].setKind(tok::annot_pragma_cx_limited_range);
+ Toks[0].setLocation(Tok.getLocation());
+ Toks[0].setAnnotationEndLoc(Tok.getLocation());
+ Toks[0].setAnnotationValue(
+ reinterpret_cast<void *>(static_cast<uintptr_t>(OOS)));
+ PP.EnterTokenStream(Toks, /*DisableMacroExpansion=*/true,
+ /*IsReinject=*/false);
}
};
@@ -846,6 +859,31 @@ void Parser::HandlePragmaFEnvRound() {
Actions.ActOnPragmaFEnvRound(PragmaLoc, RM);
}
+void Parser::HandlePragmaCXLimitedRange() {
+ assert(Tok.is(tok::annot_pragma_cx_limited_range));
+ tok::OnOffSwitch OOS = static_cast<tok::OnOffSwitch>(
+ reinterpret_cast<uintptr_t>(Tok.getAnnotationValue()));
+
+ bool IsEnabled;
+ switch (OOS) {
+ case tok::OOS_ON:
+ IsEnabled = true;
+ break;
+ case tok::OOS_OFF:
+ IsEnabled = false;
+ break;
+ case tok::OOS_DEFAULT:
+ // According to ISO C99 standard chapter 7.3.4, the default value
+ // for the pragma is ``off'. In GCC, the option -fcx-limited-range
+ // controls the default setting of the pragma.
+ IsEnabled = getLangOpts().CxLimitedRange ? true : false;
+ break;
+ }
+
+ SourceLocation PragmaLoc = ConsumeAnnotationToken();
+ Actions.ActOnPragmaCXLimitedRange(PragmaLoc, IsEnabled);
+}
+
StmtResult Parser::HandlePragmaCaptured()
{
assert(Tok.is(tok::annot_pragma_captured));
diff --git a/clang/lib/Parse/ParseStmt.cpp b/clang/lib/Parse/ParseStmt.cpp
index 2531147c23196..b6c987c4b046b 100644
--- a/clang/lib/Parse/ParseStmt.cpp
+++ b/clang/lib/Parse/ParseStmt.cpp
@@ -447,6 +447,13 @@ StmtResult Parser::ParseStatementOrDeclarationAfterAttributes(
ConsumeAnnotationToken();
return StmtError();
+ case tok::annot_pragma_cx_limited_range:
+ ProhibitAttributes(CXX11Attrs);
+ Diag(Tok, diag::err_pragma_file_or_compound_scope)
+ << "STDC CX_LIMITED_RANGE";
+ ConsumeAnnotationToken();
+ return StmtError();
+
case tok::annot_pragma_float_control:
ProhibitAttributes(CXX11Attrs);
ProhibitAttributes(GNUAttrs);
@@ -1047,6 +1054,9 @@ void Parser::ParseCompoundStatementLeadingPragmas() {
case tok::annot_pragma_fenv_round:
HandlePragmaFEnvRound();
break;
+ case tok::annot_pragma_cx_limited_range:
+ HandlePragmaCXLimitedRange();
+ break;
case tok::annot_pragma_float_control:
HandlePragmaFloatControl();
break;
diff --git a/clang/lib/Parse/Parser.cpp b/clang/lib/Parse/Parser.cpp
index 0f930248e7717..befa6eba0885f 100644
--- a/clang/lib/Parse/Parser.cpp
+++ b/clang/lib/Parse/Parser.cpp
@@ -836,6 +836,9 @@ Parser::ParseExternalDeclaration(ParsedAttributes &Attrs,
case tok::annot_pragma_fenv_round:
HandlePragmaFEnvRound();
return nullptr;
+ case tok::annot_pragma_cx_limited_range:
+ HandlePragmaCXLimitedRange();
+ return nullptr;
case tok::annot_pragma_float_control:
HandlePragmaFloatControl();
return nullptr;
diff --git a/clang/lib/Sema/SemaAttr.cpp b/clan...
[truncated]
``````````
</details>
https://github.com/llvm/llvm-project/pull/68820
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